以固体废弃物为原料烧制水处理陶粒材料的影响因素研究

Study on the Influence Factors of the Preparation of Ceramsite Material for Water Treatment from Solid Wastes

经适当处理,利用固体废弃物替代黏土及页岩等不可再生自然资源制备水处理陶粒材料是可行的。为此,开展了以脱水污泥、粉煤灰和河道淤泥为原料采用高温培烧法制备水处理陶粒材料的影响因素实验研究。结果表明:在最佳陶粒坯料粒径、Na2SiO3和CaCO3添加质量分数分别为1.0 cm,5.0%和5.0%的条件下,水处理陶粒材料的破碎率与磨碎率之和、含泥量、盐酸可溶出率、空隙率及BET比表面积分别为0.2%,0.2%,0.01%,71%和7 500 cm2/g,符合我国行业标准(CJ/T 299-2008)要求。与此同时,其浸出液中金属离子浓度明显低于我国国家标准(GB 5085.3-2007)阈值。

It is feasible that solid wastes can be used as partial or complete alternative of non-renewable natural resources(such as clay and shale) for the preparation of ceramsite material for water treatment after appropriate treatment. Therefore,the experimental study on the influence factors of the preparation of ceramsite material for water treatment from dewatered sludge, coal fly ash and river sediment was carried out in this paper. The results showed that under the optimal conditions of ceramsite billet diameter was 1.0 cm, Na2SiO3 dosage was 5.0% and CaCO3 dosage was 5.0%, the values of breaking and wear rate, silt carrying capacity, solubility in hydrochloric acid, void fraction, and BET specific surface area of ceramsite material for water treatment were 0.2%, 0.2%, 0.01%, 71% and 7 500 cm2/g, respectively, which in accordance with the China’s industrial standard of(CJ/T 299-2008). Furthermore, the concentrations of metal ions in leaching solutions of ceramsite material were very low or even non-detectable, fully meeting the requirement of the China’s national standard of(GB 5085.3-2007).